Peliti [1]}, [2]} introduced a
path-integral representation for the quadrature of the Liouville
equation (REF ) based on an expansion in
coherent states. For \(\xi \equiv \left[ {\xi }_p \right]\)  a
vector of complex coefficients, the coherent state
\(\left| \xi \right) \equiv e^{\left( a^{\dagger } - 1 \right) \xi }\left| 0 \right)\) 
